PDF malware analysis — malicious · 0992502850d47fc3

MALICIOUS

PDF

12.6 KB

MD5: aa67ce90f47f47631c829c3946f5882f SHA-1: 2e9a9303bf43c7998e1d6f9dd4de0c57eecfc852 SHA-256: 0992502850d47fc35e0ede69a76661f0762804ac3a5aa5c2016ba45c28d07597

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript, identified by multiple heuristics including 'PDF_JAVASCRIPT' and 'PDF_JS'. The JavaScript appears to be obfuscated but is designed to decode and evaluate a string, as indicated by the 'PDF_METADATA_EVAL_STAGER' heuristic. This technique is commonly used to download and execute a second-stage payload. The ClamAV detection 'Pdf.Exploit.Dropped-94' further confirms its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

ClamAV: Pdf.Exploit.Dropped-94 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-94
PDF metadata JavaScript eval stager high PDF_METADATA_EVAL_STAGER

PDF JavaScript reads document metadata fields such as title, subject, or producer, decodes character data with parseInt/String.fromCharCode style helpers, and evals the recovered stage. This is a high-signal exploit-kit staging pattern.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0076_000.js` `a0a2aa79ce42eddd2068175e0c04d501e87ba0def2931a5f9e90b824344cbfad`	pdf-javascript-stream	PDF /JS object 76 at offset 0x301B	331 bytes

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